Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b926bc49cc45bd0…

MALICIOUS

PDF

83.7 KB Created: 2021-08-08 11:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3cdf42a31618523accb2bfea41bb64fe SHA-1: 843bee76573e8f7d4299947222d10299c0ed1cd2 SHA-256: 4b926bc49cc45bd000b98b7935fd0f2cb84b37a0faf5e98cac2761aa11174e59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded links indicate an attempt to direct users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/81ead018dee8add35dd018b6eb66e1c9/pedevafumesoruwej.pdf In PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/1886a85a69698703d5455cc1f058d116/22551225237.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/sjdn1lhlusa0g3i29850llhg6f/jomarotovulukozinediwo.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/96295105259.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/94037184468.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06a37bcd3f---puwutilixenepi.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/lonezuwebiwori.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/noobd09cft3e6civufgnin2lg2/sokeriwe.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/26710172662.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609109ab9cf7e---48117259614.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/9801556815.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/47f3290e032ef2fdfc73fd506f24cab5/sizawabuzejabekenufu.pdfIn PDF document text
    • http://potlista.com/file/files/33165059179.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/caf282f44dea5bb6cf86a3a9622ecdbb/japuguzi.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/jifirexuduwafizarowo.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/77440338932.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a48c86c1ff---tavuxonaxel.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/67415163466.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/3828330844.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/c8827d460e1ae2458ad5d8807964036f/sitokosaxaguputuwojar.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/4bff268a86da5b2c045547e2333687e8/12855112535.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/22442096924.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/domoji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+rock+cycle+lesson+3+outline+answer+keyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE560 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD72 16464 bytes
SHA-256: ca06c57dbe2728a128040bbcf04290efc79f0569ecac0a3f60b631ef2aa158e6
font_02_sfnt_off0001280f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280F 10852 bytes
SHA-256: 1a2ade12721cb32c9c11d5634ef01ef86f281f23fdd499a3e5d778b259dd748c

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